If the car sits for more than a day the battery is dead. Just replaced the battery so something else is draining it. Recently, the alarm went off in the middle of the night, and now it goes off every time I unlock and open my door. HELP! I have the switch that disconnects the power to the car, but that's just a pain to have to lose all my preset station on my stereo, I shouldn't have to do this. Please help!!
Does the battery hold charge? Have you load tested the new battery or left the new battery disconnected for a couple of days to see if it is holding charge.
It does not happen often but the new battery could still be the problem.
The other way to find out what is going on is to remove one or two car fuses inside the dash at the end of each day and if the car battery is not flat the following day you have narrowed down the fault.
My 1994 Suzuki has an alarm sensor attached to the firewall directly behind the battery, and I've had trouble similar to yours (except for the charge drain issue). Because the US replacement batteries I've had to install over the years were larger than the original Suzuki factory battery, they eventually broke that plastic sensor and that shorted out some of the wiring. I disconnected the sensor (follow the wiring leads--one grounds to the firewall) and that seems to have stopped the erratic alarms.
So you might check that sensor and make sure the case is intact and the wiring is grounded/connected.
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